Bulletin 4142-VMSeptember 2004

Parker Vent Master

TECNI-AR Ltda www.tecni-ar.com.br Tel: (31)3362-2400

Parker Vent Master

2 Parker Hannifin CorporationInstrumentation Products DivisionJacksonville, Alabama

IntroductionSample streams discharged from process analyzers have historically been vented to atmosphere for disposal.

This method is not only convenient, but also provides a very stable reference pressure necessary to insure

accurate and repeatable analysis results. As environmental legislation becomes more stringent, sample dis-

charge to atmosphere is no longer allowable in many cases and analyzer engineers must choose an alternate

method. Catalytic burners offer one alternative, however they do not completely eliminate emissions, have a

limited flow capacity and require frequent maintenance. Discharge to a vent header that subsequently feeds a

flare header and stack offers another choice, but the dynamic nature of the header is not conducive to pressure

stability which compromises analysis accuracy. Complex vent systems installed plant-wide are also available,

but they are highly engineered and expensive to install.

The Parker Vent Master is a totally mechanical integrated solution that actually creates a stable pressure within

the vent header within 0.3” H20. Test results prove the Vent Master provides analysis accuracy within 0.06%

over a vent header flow range of 0-18 SLPM with a flare header back pressure as high as 20 psig.

Theory of OperationThe Vent Master is comprised of regulators, gauges,

a rotometer and an eductor assembled in a compact

panel for ease of operation and installation. A separate

Pressure Controller is mounted directly to the vent

header providing a constant flow of N2 to the header at

a rate sufficient to maintain a constant pressure of

approximately 1” H20. As multiple analyzers dispose

sample gas into the header by varying amounts, the

Vent Master senses the header pressure

and compensates to maintain a constant pressure

regardless of discharge volume. The Vent Master

also isolates the vent header from Flare Header

pressure fluctuations up to 20 psig with test results

indicating stability within 0.3” H2O.

FLARESTACK

VENT HEADERPRESSURE

CONTROLLER

SAMPLEDISPOSAL

VENT MASTER(EDUCTOR MODEL)

VENT HEADER

NITROGEN

SAMPLEDISPOSAL

Image courtesy of ABB

TECNI-AR Ltda www.tecni-ar.com.br Tel: (31)3362-2400

Parker Vent Master

3 Parker Hannifin CorporationInstrumentation Products DivisionJacksonville, Alabama

PerformanceMaximum Vent Header Discharge Volume: 18 SLPM

Maximum Flare Backpressure: 20 psig

Achieved % Error: 0.06%

Vent Master Summary• Simple solution to achieve environmental compliance

• Eliminate costly catalyst procurement, replacement labor

and disposal

• Maintains analyzer data integrity during plant upset conditions

• Minimizes N2 consumption on Eductor models with the

Economizer Circuit

• Compact package, easy to install and operate

• Pre-engineered, easy startup and commission steps

• No maintenance required

0 3 96 15 1812

0

0.5

1.5

1.0

2.5

2.0

VENT HEADER FLOWRATE (SLPM)

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Parker Vent Master

Bulletin 4142-VM, 5M, 09/04

Parker Hannifin CorporationInstrumentation Products Division2651 Alabama Highway 21 NorthJacksonville, AL 36265-9681Phone: (256) 435-2130Fax: (256) 435-7718www.parker.com/ipdus

Design Options & How to OrderVENT-MASTER-EDR-xx (see layout, below left)

The EDR model employs an eductor, sized to accommodate maximum flow rates of 0-6, 0-12 or 0-18 SLPM

vent header flow rates with a worst-case flare header back pressure of 20 psig. All EDR models incorporate

a unique economizer circuit that conserves N2 consumption when header back pressure conditions are low

by reducing the eductor motive force flow to the amount necessary to maintain minimum vacuum on the

eductor suction. Specify eductor flow range by choosing one of the following suffixes on the part number:

06 = 0-6 SLPM, 12 = 1- 12 SLPM, 18 = 0-18 SLPM. (Example: VENT MASTER-EDR-18)

VENT MASTER-PMP (see layout, below right)

The PMP model is designed for use in applications where a sample pump is already in place.

VENT-MASTER-NPE (see layout, below right)

The NPE model is designed for use in applications where a plant vacuum source is available.

CONTROLLERPRESSURE

VENT HEADER

(EDUCTOR MODEL)VENT MASTER

VENT HEADER

FLARESTACK

DISPOSALSAMPLE

DISPOSALSAMPLE

NITROGEN

OR

PLANTVACUUM

VENT HEADER

(16.0")

(14.0")

12"

12"

15"

Vent Master

(all models)

Vent Header Pressure Controller

(isolation valve not included)

FLARESTACK

VENT HEADERPRESSURE

CONTROLLER

SAMPLEDISPOSAL

VENT MASTER(EDUCTOR MODEL)

VENT HEADER

NITROGEN

SAMPLEDISPOSAL

InstrumentationSystems

All our resources apply to meetingyour specificationsOur facilities are completely equipped to handle yourstandard and special needs – rapidly, responsively,and reliably. We have assembled all the necessaryCNC machining centers, CNC lathes, secondarymachines, chemical finishing, QA equipment, andassembly / test / packaging capabilities in one loca-tion. We have also created partnerships with oursubcontractors to assist us in meeting your specifica-tions.

Custom responses to special

challengesWe welcome the challenge of designing, engineering,and manufacturing cost-effective and reliable solu-tions to your special process and equipment prob-lems. When you need to contain or control processfluids…and particularly when standard devices andstock answers aren’t the real solution – call us. Ourresponses have already included a wide variety ofsystems – from a simple sample loop with two needlevalves and a sample cylinder to sophisticated controlsystems such as the vent recovery system picturedabove.

Analyzer Pressure Regulation and Vent Recovery System

Bulletin 4145-ISAugust 2002

ANALYZER

PRESSURE

REGULATOR

INSTRUMENTATION VALVE DIVISIONJACKSONVILLE, ALABAMA, USAMODEL VRAZ-3-34-42-S1-V-SSNUMBER A649971

SAMPLE INLET

ZERO

CALIBRATION

SAMPLE RETURN

COMMON

VENT

RETURN

OUTLET

21TJ

427-R2K-V-SS-3

MADE IN USA

BY-P

AS

SS

TR

EA

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Parker Instrumentation Valve Division specializes indesigning and building the valves and systems youneed to meet the special requirements and exactingspecifications of the applications in your plant andyour process.

Getting that done means applying some advancedexpertise and sophisticated capabilities. We havealready manufactured valves for literally every instru-mentation application and have specialty valving andequipment serving dependably around the world.

All that expertise is ready now to apply to your ownspecial needs. Whenever you need anything in thefollowing categories – and especially when you needsomething beyond – call us.

• Instrumentation Valve Assemblies

• Sample Loops

• Recovery Systems

• Stream Switches

• Manifolds

• Surface Mount Systems

Stream Switching System

Instrumentation Systems

Bulletin 4145-IS, 5M, 08/02© Copyright 2002, Parker Hannifin Corporation. All Rights Reserved.

Parker Hannifin CorporationInstrumentation Valve Division2651 Alabama Highway 21 NorthJacksonville, AL 36265-9681Phone: (256) 435-2130Fax: (256) 435-7718www.parker.com/IVD

Custom Responses

Valve and Flow Sensor Manifold Sample Loop

Needle Valve Assembly Compressed Natural Gas Vehicle Fueling Manifold

Modular Surface Mount Gas Systemwith Stream Switching

ANALYZER

PRESSURE

REGULATOR

INSTRUMENTATION VALVE DIVISIONJACKSONVILLE, ALABAMA, USAMODEL VRAZ-3-34-42-S1-V-SSNUMBER A649971

SAMPLE INLET

ZERO

CALIBRATION

SAMPLE RETURN

COMMON

VENT

RETURN

OUTLET

21TJ

427-R2K-V-SS-3

MADE IN USA

BY-P

AS

SS

TR

EA

M 1

FLO

W

AN

ALY

ZE

RF

LO

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Bulletin 4141-VRNovember 2001

Analyzer Pressure Regulationand Vent Recovery System

Unparalleled pressure and flow stability

The Parker Analyzer Pressure Regulation and Vent Recovery System automatically and continuously adjustsfor variations in gas supply pressures and flows. This system has been engineered to meet the requirementof continuous analyzers designed to operate at constant pressure in order to provide accurate analyses ofgases. The combination of pressure and flow regulation provides the required stability even with greatlyvarying inlet and outlet pressures.

Model Shown: VRAZ3-01-22-DX-V-SS

Analyzer Pressure Regulation and Vent Recovery System

Parker Hannifin CorporationInstrumentation Valve DivisionJacksonville, Alabama

3

Performance Example 1 - VaryingInlet Pressure with ConstantOutlet Pressure

OptionsBy-pass Filter - Approximately 90% of the inlet flow by-passes the cartridge filter and exists the filter bowl. Thisprovides three benefits: 1) It reduces the transport time of the sample stream from the process line to the ana-lyzer; 2) Provides a continuous flushing action on the filter element; and, 3) The life of the filter element is greatlyextended since only a small percentage of the flow is filtered - and only when the stream is selected for analysis.

Manual Stream Switching - The R-Max™ Stream Switching System is replaced with two-way and three-wayMB Series manual Ball Valves. The optional By-pass Filter(s), if ordered, is mounted as a stand-alone unitdownstream of the sample inlet MB Series manual Ball Valve(s).

Integral Aspirator - A Parker VC Vacuum Generator is added between the Flow Controller and MB Series BallValve on the Sample Return line. A Parker IR4000 Pressure Regulator is also added to control the vacuumgenerated.

Filter Purge Valve - A three-way MB Series manual Ball Valve is placed upstream of the Filter to enable switch-ing between sample and purge gas.

Aspirator and Filter Purge Valve - Adds both the Integral Aspirator and the Filter Purge components to thepanel.

Analyzer Pressure set to 12.7 psia (0.87 bar);Supply Pressure set to 14.5 psia (1.01 bar);Outlet Pressure varied from 1 to 11 psia (0.07 to 0.76 bar)

Performance Example 2 - VaryingOutlet Pressure with ConstantInlet Pressure

Typical Two Stream Vent Recovery System

Analyzer Pressure set to 5 psig (0.3 bar);Supply Pressure varied from 20 to 90 psig (1.4 to 6.2 bar)

Analyzer Pressure Regulation and Vent Recovery System

Dimensions**

How to Order

Bulletin 4141-VR, 5M, 11/01

** For a three or four stream VRAZ System Series. Subject to change without notice.( ) Denotes dimensions in millimeters

Parker Hannifin CorporationInstrumentation Valve Division2651 Alabama Highway 21 NorthJacksonville, AL 36265-9681Phone: (256) 435-2130Fax: (256) 435-7718www.parker.com/IVD

VRA Z 3 - 3 4 - 4 2 - S1 - V - SS

System SeriesVRA = Automatic Stream SwitchVRM = Manual Stream Switch

System OptionsA = Integral AspiratorB = Filter Purge ValveC = Aspirator & Filter Purge ValveZ = None of the above

Number of Streams3 = Three4 = Four

Inlet Pressure Gauge0 = 30 psig1 = 60 psig2 = 100 psig3 = 200 psig

Pressure Regulator0 = 0 - 5 psig1 = 1 - 30 psig2 = 1 - 60 psig3 = 2 - 100 psig4 = 2 - 250 psig

By-pass Flowmeter Range (LPM)0 = 0 - 2.22 = 0 - 4.54 = 0 - 6.16 = 0 - 10.7

Analyzer Flowmeter Range (LPM)0 = 0 - 2.22 = 0 - 4.54 = 0 - 6.16 = 0 - 10.7

By-pass Filter0 - No Filter*S5 - 5 Micron Sintered MetalS1 - 10 Micron Sintered MetalS2 - 20 Micron Sintered MetalS4 - 40 Micron Sintered MetalS7 - 70 Micron Sintered MetalS0 - 100 Micron Sintered MetalDQ - 93% Microfibre @ 0.01 MicronDX - 99.999% Microfibre @ 0.01 Micron

Seal MaterialV = Fluorocarbon Rubber

Component MaterialsSS = Stainless Steel

* Systems without a By-pass Filter will have a Tee branching from the Sample Stream Switch inlet to the By-pass Flowmeter.